<!doctype html>
<html>
<head>
    <meta charset="UTF-8">
    <title>*号三角</title>
</head>
<body>
    <script>
        for(var i=1;i<=10;i++){
            for(var j=1;j<=i;j++){
                document.write("*");
            }
            document.write("<br>");
        }
    </script>
</body>
</html>